Adding functions to Standard Library

src/StandardLibrary/Functions/Trigonometry/Atan2.cs

@@ -0,0 +1,36 @@
+namespace CSMic.StandardLibrary.Functions.Trigonometry
+{
+    public class Atan2 : FunctionBase, ICodedFunction
+    {
+
+        public string Name
+        {
+            get
+            {
+                return "atan2";
+            }
+        }
+
+        public override IEnumerable<FunctionArgument> ExpectedArguments
+        {
+            get
+            {
+                yield return new FunctionArgument("value", FunctionValue.NUMBER);
+                yield return new FunctionArgument("value", FunctionValue.NUMBER);
+            }
+        }
+
+        public FunctionValue Execute(params FunctionArgument[] args)
+        {
+            return Execute(args, (_args) =>
+            {
+                var inputFirst = _args[0].Value;
+                decimal valueFirst = Convert.ToDecimal(inputFirst.Value);
+                var inputSecond = _args[1].Value;
+                decimal valueSecond = Convert.ToDecimal(inputSecond.Value);
+
+                return new FunctionValue(FunctionValueType.Numeric, Math.Atan2((double)valueFirst, (double)valueSecond));
+            });
+        }
+    }
+}